在Linux下构造高性能、高可用、高可伸缩性的服务集群（一）

cd / tmp/download/ipvs-1.0.9/ipvs/ipvsadm
make install

ipvsadm

director:   /usr/src# ipvsadm
IP Virtual Server version 0.2.7 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port          Forward Weight ActiveConn InActConn

#!/bin/bash
#---------------mini-rc.lvs_dr-director------------------------
#set ip_forward OFF for vs-dr director (1 on, 0 off)
cat   /proc/sys/net/ipv4/ip_forward
echo 0 >/proc/sys/net/ipv4/ip_forward

#director is not gw for realservers: leave icmp redirects on
echo 'setting icmp redirects (1 on, 0 off) '
echo 1 >/proc/sys/net/ipv4/conf/all/send_redirects
cat    /proc/sys/net/ipv4/conf/all/send_redirects
echo 1 >/proc/sys/net/ipv4/conf/default/send_redirects
cat    /proc/sys/net/ipv4/conf/default/send_redirects
echo 1 >/proc/sys/net/ipv4/conf/eth0/send_redirects
cat    /proc/sys/net/ipv4/conf/eth0/send_redirects

#add ethernet device and routing for VIP 192.168.7.110
#if use backup director ,pay any attention about bellow
/sbin/ifconfig eth0:0 192.168.7.110 broadcast 192.168.7.110 netmask 255.255.255.255 up
/sbin/route add -host 192.168.7.110 dev eth0:0
#listing ifconfig info for VIP 192.168.7.110
/sbin/ifconfig eth0:0

#check VIP 192.168.7.110 is reachable from self (director)
/bin/ping -c 1 192.168.7.110
#listing routing info for VIP 192.168.7.110
/bin/netstat -rn

#setup_ipvsadm_table
#clear ipvsadm table
/sbin/ipvsadm -C
#installing LVS services with ipvsadm
#add telnet to VIP with round robin scheduling
/sbin/ipvsadm -A -t 192.168.7.110:telnet -s rr

#forward telnet to realserver using direct routing with weight 1
/sbin/ipvsadm -a -t 192.168.7.110:telnet -r 192.168.7.11 -g -w 1
#check realserver reachable from director
ping -c 1 192.168.7.11

#forward telnet to realserver using direct routing with weight 1
/sbin/ipvsadm -a -t 192.168.7.110:telnet -r 192.168.7.12 -g -w 1
#check realserver reachable from director
ping -c 1 192.168.7.12

#displaying ipvsadm settings
/sbin/ipvsadm

#not installing a default gw for LVS_TYPE vs-dr
#---------------mini-rc.lvs_dr-director------------------------